Incandescent lamp.



Patented J uly 3, 1017.

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HOWARD LEXANDER STYRING, 0F MIDDLETOWN, OHIO.

WCANDESCENT LAMP.

Specification of Letters Patent.

Patented Tully 3, 151W..

Application led January 21, 1916. Serial No. 73,495.

To all whom t may concern.'

Be it known that I, HowRn ALEXANDER STYRING, a 'citizen of the United States of America, residing at Middletown, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in an Incandescent Lamp, of which the Jfollowing is a specification, reference being had therein to the accompanying drawing.

This invention relates to, incandescent lamps and has for its principal object the.

production of aV simple .and efficient lamp which is so constructed as to be provided With a plurality of filaments arranged so that after one filament has been burned out the lamp may be slightly moved thereby forming a new contact for forming a new circuit, thus utilizing the remaining lilament.

Another object of this invention is the production ofvan incandescent lamp wherein the head of the lamp upon which the bulb is carried is provided with a plurality of conducting portions which are so formed as to allow only a limited number thereof to engage the contacts carried bythe electric socket whereby only one filament will be utilized at a single time this head being capable of being turned so that the remaining contacts may be utilized, thus causing the remaining filament to be lighted.

A still further object of this invention is the production of an incandescent lamp wherein a removable thimble is carried within the electric socket, this thimble being provided with contact blocks so that upon the turning ofl this thimble contacts may be made or broken, whereby upon the movement of the lamp head to a desired position within said removable thimble the correct circuit may be formed for throwing the circuit through a desired filament. Y

With these and other objects in view, this invention consists of certain novel combinations, constructions, and arrangements of parts as will be hereinafter fully described and claimed.

In the accompanying drawing:

Figure 1 is a central vertical section through the complete incandescent lamp, socket and thimble as constructed in accordance with this invention.

Fig. 2 is a section taken on the line 2-2 of Fig. 1, looking in vthe direction of the arrows.

Fig. 3 is a section of Fig. 1. v

Fig. 4 is a side elevation of the removable thimble.

Fig. 5 is a top plan of the lamp head.

Fig. 6 is a detail perspective view of a slightly modified form of the detachable thimble. f

Fig. 7 is a fragmentary sectional view through a portion of the modified thimble illustrating how the same is used in connection With another form of socket and further showing how the thimble is removably retained in position.

Referring to the accompanying drawing by numerals it will be seen that the elec tric socket comprises a shell 1 having a cap taken on the line 3 3 2 carried thereon, carrying the tip 3U through which the feed cables 4 and return cables 4 extend. This shell 1 carries the hollow porcelain body 5 which is internally threaded as shown at 6 and which carries the wall 7 i upon Which there is formed an inwardly extending lug 8. This llug 8 is provided with a central passage 9 for purposes to be hereinafter set forth. The feed cables 4: pass around the outer yportions of the wall 7 and also around the body 5, as shown clearly in Fig. 1 so as to be connected to the contact blocks 10, these contact blocks being internally threaded as are the inner portions of the body 5. l

The hollow thimble 11 is externally threaded Aas shown at 12 and internally threaded as shown at 13. This thimble is further provided with the contact blocks 13 formed of any suitable conducting material such, for instance as copper, although it should, of course, be understood that the thimble itself should be made of any suitable insulating material such for instance as hard rubber, enamel, or porcelain. This thimble 11 is adapted to be threaded into the inner portions of the body 5 so as to allow its contact blocks 13 lto be moved into l engagement with the contact blocks 10 carin Figs. 1 .ma 2. The ends of the late 14.

are thickened as shown at 15 for 'orming contact portions to be hereinafter set forth.

After the operation above set forth has been completed the thimble is in position to receive the head of the lamp. This head 16 has the bulb 17 formed thereon and also the glass neck 18. This glass neck 18 carries the two filaments 19 at its outer end which are connected to the conductor wires carried therein. It will be seen that the 'head 16 is, of course, formed of any suitable insulating materialsuch as hard rubber or porcelain although it carries upon its outer periphery the insulating sheet material 20 which, when the head is threaded into the interior of the thimble 11 will prevent short circuiting or false contacts. The conductor wires 21 carried by the glass neck 18 extend therefrom through the head and the contact blocks 22 carried by the head. The wires 21 of course, extend soas to be connected to the laments 19. The return wires 23 connected `to the filaments and carried by the glass neck 18 extend from the neck to the inner end of the head so as, to be connected to the top contact blocks 24. As the head is screwed into the thimble 11 the insulating sheet material 20 will, as above `set forth, prevent false contacts or short circuiting upon continued rotation thereof for one of the contact blocks 22 carried by the head 16 will be moved into engagement with one of the contact blocks 13 carried by the thimble 11. Thus it will be seen that as the contact blocks 13 carried by the thimble 11 are at this time engaging the contact blocks 10 carried by the body 5 one circuit will be formed. At this time, however, the rotation of the head will 'be such as to move the head far enough into theinterior of the thimble to cause the inner end of the head 16 to be adjacent the lug 8. Therefore, the rotation of the head will cause one of the contact blocks 24 to move into engagement with one of the thickened ends 15 of the plate 14, thus forming a circuit for causing one of the laments 19 to receive the force of the current and owing to the resistance of the filament will, of course, cause the lamp to light. As soon as this circuit is formed the light will, of course, burn until it is burned out. Under ordinary circumstances as is well known after the lilament is burned out it is necessary to destroy the lamp and provide a new one. When this device is in use, however, after one lament has been burned out the bulb 17 may be gripped and then by being turned to one side will cause the circuit as shown in Fig. 1 to be broken. Upon "the breaking of this circuit, however, it will be seen that the movement of the head 16 will cause the insulating sheet material 20 to be moved so as to allow the remaining contact block 22 carried by the head to move into` engagement with the remaining contact block 13 carried by the thimble 11, while the remaining contact block 24 will engage the opposite thickened end 15 of the plate 14 thus forming a new circuit which w'ill cause the remaining filament to burn. Y

By referring to Figs. 6 and 7 it will be seen that a slightly modified form of thimble has been produced. As herein disclosed the thimble 25 although provided with the threadedinner portion 26 for the reception of the head of the lamp is provided with a smooth outer periphery as shown at 27 so as to permit of its being easily slipped into the body 28 of the socket shell 29. Of course, the lamp head 16`having the insulating sheet material 20 may be threaded into the interior of this thimble 25 and this form to the preferred form hereinbefore described. This thimble 25 is provided upon its outer periphery with the annular groove 30 into which extends the set screw 31 carried by the body 28 of the socket shell 29. The only difference between the construction of the modified form and the construction of the preferred form is that the thimble in the preferred form is screwed into the body of the socket While in the modified form the thimble is simply slipped thereinto and is retained therein by means of the set screw although it will be permitted to be turned in a ldesired direction when necessary.

From the foregoing description it will be seen that a very simple and eicient structure vhas been produced wherein the contacts are so arranged as to allow only a lsingle filament to be utilized at a single time although when one filament is burned out it will be seen that by simply turning the lamp bulb to one side the head will be turned so that a number of new contacts will engage each other so as to form a new circuit and thus allow the remaining lilament to burn. 1t is obvious that not only filaments of the same size but filaments of various sizes may be employed so that simply by turning the bulb a high or low light may be provided such as is necessary in sick rooms so that when a very high light is not desired the lamp may be turned so as to allow a low light to burn.

What is claimed is:

1. In a device of the class described, the

points with an electric current,

said head, a plurality of contact blocks carried upon the inner end of said head, filaments carried by said head, means for electrically connecting said filaments to said. contact points and said contact blocks of said head, said head being adapted to be turned so as to cause only a single contact point and a single contact block of said head to engage a plurality of the contact points of said socket, whereby only a single circuit will be formed at a single time so as to allow only a single filament to be lighted, a bulb carried by said head, said bulb being adapted to be turned so as to allow the remaining contact point and contact block of said head to engage the remaining contact points of said socket whereby a new circuit will be formed, while the first circuit will be broken, thereby allowing the remaining filament to be utilized.

2. In a device of the class described, the combination of a socket comprising a shell, a body carried within said shell and being internally threaded, a wall formed upon the inner portion of said body, an inwardly ex'- tending lug formed upon said wall, contact points carried by said body and communicating with the inner threaded portion thereof, an elongated plate having thickened ends fixedly mounted upon the inner end of said lug, means electrically connecting said contact points to said plate, a lamp head carried by said body, a bulb carried by said lamp head, filaments carried within said bulb, contact blocks carried upon the inner end of said head, contact points carried upon the periphery of said head, means for electrically connecting said last-mentioned contact points and said contact blocks to said filaments, said head being capable of being turned so as to move said contact blocks into engagement with said plate, means for connecting one of said contact points of said head to one of the contact po'ints of said body, whereby a circuit will be formed for utilizing a single lament, said head being capable of being turned when desired so as to break the original circuit and form a new circuit for utilizing the remaining filament.

'3. In a device of the class described, the combination of a socket comprising a shell,

' a body carried within said shell and being lamp head threaded into said thimble, an

insulating sheet interposed between said head and thimble, a bulb carried by said head, filaments carried within said bulb, contact points carried by said head and communicating with its periphery, contact blocks carried upon the inner end of said head, wires connected to said filaments, said last-mentioned contact points and to said contact blocks, Said last-mentiomed contact points and said contact blocks being arranged so as to allow only one contact block to engage said plate and one contact point to engage one contact point of said thimble at a single time, thereby forming only a single circuit whereby only a single filament may be utilized, said head being capable of being turned so as to cause the-remaining contact block to engage said plate and the remaining contact point of saidhead to engage the lremaining contact point of said thimble, thereby breaking the original circuit and forming a new circuit for utilizing the remaining filament.

In testimony whereof I hereunto aibx my signature.` l

HOWARD ALEXANDER BNG. 

